常压等离子体降解黄曲霉毒素B_1的效果研究

Degradation effect of atmospheric pressure plasma on aflatoxin B_1

采用常压等离子体对乙腈中黄曲霉毒素B_1(AFB_1)进行降解。利用单因素实验,考察了放电间距、处理电压、放电时间以及AFB_1初始浓度对AFB_1降解率的影响,在此基础上进行了BoxBehnken的实验设计,选取AFB_1降解率作为响应值,优化了AFB_1的降解条件。结果表明:各因素对AFB_1降解率的影响大小依次为处理电压>放电时间>AFB_1初始浓度。常压等离子降解AFB_1的最佳工艺条件为处理电压170 V、放电时间236 s、AFB_1初始浓度5 mg/L、放电间距2 cm。AFB_1的降解率高达92.45%,与预测值93.94%相接近,偏差为1.49%。

Atmospheric pressure plasma was used to degrade the aflatoxin in acetonitrile. The influence of four independent variables, discharge distance, treatment voltage, discharge time and initial concen-tration of AFB1, on degradation rate of AFB1 were investigated by single factor test. Based on this, Box -Behnken experiment was designed with degradation rate of AFBt as response value, the degradation conditions of AFBt was optimized. The experimental results showed that the factors influencing the degra-dation rate of AFBt in acetonitrile were in order as follows： treatment voltage 〉 discharge time 〉 initial concentration of AFB^ The optimum process parameters of degradation of AFBt by atmospheric plasma were obtained as ： treatment voltage of 170V, discharge time of 236s, initial concentration of AFB1 of 5mg/L, discharge distance of 2 cm. Under the conditions, the degradation rate of AFBt can reach to 92. 45% , which is close to predictive value of 93. 94% with deviation of 1.49%.